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  <script>
    //看图对答案 真的c 看图 解决一切问题
    p.__proto__ // Person.prototype
    Person.prototype.__proto__ //Object.prototype     
    p.__proto__.__proto__//Object.prototype
    p.__proto__.constructor.prototype.__proto__//Object.prototype
    Person.prototype.constructor.prototype.__proto__//Object.prototype
    p1.__proto__.constructor//Person
    Person.prototype.constructor//Person
  </script>
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